Total Maximum Daily Loads (TMDLs) for Indicator Bacteria in (TMDLs) for Indicator Bacteria in the Armand Bayou Watershed Hanadi S. Rifai and Rose Sobel Civil and Environmental Engineering University of Houston University of Houston Tina Petersen CDM Smith CDM Smith Armand Bayou I Armand Bayou I- y -Plan Meeting Plan Meeting g August 13, 2013 August 13, 2013
Project Objectives Project Objectives • Develop technical support document (TSD) and TMDLs for Assessment Units: – 1113_02 – Armand Bayou Tidal – 1113A_01 – Armand Bayou Above Tidal (unclassified water body) – 1113B 01 – Horsepen Bayou Tidal (unclassified water body) 1113B_01 Horsepen Bayou Tidal (unclassified water body) – 1113C_01 – Unnamed Tributary to Horsepen Bayou (unclassified water body) – 1113D_01 – Willow Springs Bayou (unclassified water body) – 1113E_01 – Big Island Slough (unclassified water body) • Support Public Participation
Key Steps in TSD and TMDLs Key Steps in TSD and TMDLs • Data Compilation and Analysis Data Compilation and Analysis • Pollution Source Assessment • Development of Flow Duration Curves (FDCs) l f l i C ( C ) and Load Duration Curves (LDCs) (non ‐ tidal) • Tidal Prism mass balance (tidal)
Data Compilation and Analysis WATERSHED CHARACTERISTICS WATERSHED CHARACTERISTICS
Armand Bayou Watershed Area Area Watershed (acres) 1113G Armand 37,822 Bayou y 1113_02 673 1113F 1113A_01 3688 1113H 1113B_01 1113B 01 10 668 10,668 1113 03 1113_03 1113C_01 1,777 1113D_01 4,871 1113E_01 5,106 1113_01
Land cover and Population Population Watershed (2010 Census) A Armand Bayou d B 125 844 125,844 1113_02 294 1113A_01 14,376 1113B_01 27,494 1113C_01 17,680 1113D_01 _ 21,922 , 1113E_01 14,782 Land Cover Classes* *NLCD
Municipalities and Population Growth Projected Projected Percent Growth Sub ‐ City City in Sub ‐ Rate watershed watershed (2030)* Deer Park 7 % 1113D_01 50 % 1113B_01 3 % Houston 25 % 1113C_01 0.5 % % 1113D_01 4 % La Porte 20 % 1113E_01 22 % 1113_02 2 % 1113A_01 13 % Pasadena 24 % 1113B 01 _ 2 % 1113D_01 3 % 1113E_01 1 % Webster 59 % 1113C_01 2 % *TWDB
Precipitation and Climate 1981 ‐ 2010 Watershed ____Average*:____ Temperature: 70.3 o F p Range: 45.1 ‐ 84.6 o F ** *NOAA ** HCFCD
Data Compilation and Analysis INDICATOR BACTERIA INDICATOR BACTERIA
Station locations and impairment history Designated Year 1 st Stream Use* Segment on AU ID Length Contact Name 303(d) (miles) Recreation list Armand d 1113_02 NS 2006 1.8 Bayou Tidal Armand 1113A Bayou NS 1998 4.6 Above Tidal Above Tidal Horsepen 1113B NS 2006 6.7 Bayou Tidal Unnamed Tributary to Tributary to 1113C NS 2010 2 Horsepen Bayou Willow 1113D Springs NS 2010 2.9 B Bayou Big Island 1113E NS 2012 6.5 Slough NS = Not Supporting; FS = Fully Supporting *TCEQ
Indicator Bacteria data summary Indicator Single Geomean sample criterion criterion E E. coli li 399 399 126 126 Enterococcus 104 35 Indicator % Geo ‐ AU ID n Bacteria Exceedance mean 1113_02 ENT 26.3% 38.9 80 1113A EC 136 47.1% 419.9 1113B ENT 103 28.2% 58.9 1113C 1113C EC EC 30.4% 30 4% 192.2 192 2 69 69 1113D EC 67.1% 628.3 70 1113E EC 65.7% 646.4 67 All values in CFU/100 mL *TCEQ
Pollution source assessment PERMITTED AND NON ‐ PERMITTED PERMITTED AND NON PERMITTED SOURCES
Permitted Sources % Watershed Receiving Receiving AU ID under MS4 Stream Jurisdiction Armand Bayou 100% 1113_02 Tidal Armand Bayou 100% 1113A Above Tidal 100% 1113B Horsepen Bayou Unnamed 100% 1113C Tributary to Horsepen Bayou Willow Springs p g 100% 100% 1113D 1113D Bayou 93% 1113E Big Island Slough
Permitted Sources Average Average Permitted AU Receiving TPDES NPDES Facility Date Monthly Number Facility Name Flow ID Water Number Type Range Flow (MGD) (MGD) 11/30/03 11/30/03 Metro Central Metro Central Sewerage Sewerage 5 1.44 10495 ‐ 152 TX0069736 WWTP Systems ‐ 5/31/13 Robert T Savely Horsepen 12/31/04 Water Sewerage 1113B 10 5.58 10539 ‐ 001 TX0022543 Bayou Tidal Reclamation Systems ‐ 5/31/13 Facility Facility City of Houston Water n/a n/a n/a 03523 ‐ 000 TXL005000 Sludge Plant Supply Equistar Big Island Industrial 1113E n/a n/a n/a 03029 ‐ 000 TX0103900 Chemicals Bayport Slough Stormwater Complex p MGD = Millions of Gallons per Day; n/a = Not Applicable Enteroccci Daily Load 2009-2013 TPDES Facility Name Facility Name # of MCMX % of MCMX # of MCAV % of MCAV Number Exceedances Exceedances Exceedances Exceedances n/a n/a n/a n/a 10495 ‐ 152 Metro Central WWTP Robert T Savely Water Robert T Savely Water 4 9.5 % 0 n/a 10539 ‐ 001 Reclamation Facility MCMX = Measurement: Concentration Maximum, MCAV = Measurement: Concentration Average; n/a = Not Available *TCEQ
SSOs and Illicit Discharges * ** *TCEQ **HCFCD
SSOs and Illicit Discharges Discharges Amount NPDES Facility Number Date Range Date Range Facility (Gallons) Facility Name Permitee Permit of ID No. Events From To Min Max Robert T. Clear Lake City 10539 ‐ 0022543 51 8/22/03 / / 5/14/13 / / 0 19,200 , Savely WWTF Water Authority S l WWTF W t A th it 001 001 Metro Cental 10495 ‐ City of Houston 0069736 2 4/18/12 5/12/12 200 1000 WWTF 152 City of Deer 10519 ‐ City of Deer Park 0025321 21 9/26/03 6/26/13 0 10,000 Park WWTF 002 Little Cedar 10206 ‐ Cit City of La Porte f L P t 0022799 0022799 23 23 6/11/06 6/11/06 4/27/13 4/27/13 0 0 72 000 72,000 Bayou WWTF 001 *TCEQ **HCFCD
Non ‐ permitted sources: OSSFs On ‐ Site Sewage Segment Facilities (OSSFs) 1113_02 1 1113A 0 1113B 1113B 9 9 1113C 0 1113D 0 1113E 10 * *H ‐ GAC
Non ‐ permitted sources: Animals Number of Animal Units Number of Animal Units Segment Dogs Cats Animal 1113_02 1113A 1113B 1113C 1113D 1113E Type 1113_02 120 137 Cattle and 0 32.8 232.8 0 104 55.2 Calves 1113A 1113A 3 061 3,061 3 483 3,483 Layers 0 0.2 1.42 0 0.63 0.33 1113B 6,424 7,310 Other 0 0.04 0.26 0 0.12 0.068 Poultry 1113C 4,664 5,307 Horses Horses 0 0 8 8 53 53 0 0 24 24 13 13 1113D 4,735 5,388 0 Swine 0.25 1.5 0 0.50 0.25 1113E 3,003 3,417 Sheep/ 0 0.4 2.7 0 1.3 0.6 Lamb/Goat 0 0 0 0.01 Turkeys 0.02 0.01 Ducks 0 0 0.04 0 0.02 0.01 Geese 0 0 0.03 0 0.01 0.00 Deer 0 0.18 1.25 0 0.54 0.36 0.45 0 0.45 Donkey 0 1.8 0.9 Rabbits 0 0 0.02 0 0.01 0 Llamas Llamas 0 0 0 0 0.4 0 4 0 0 0.2 0 2 0 0 Total: 0 32.8 232.8 0 104 55.2 Armand Bayou Nature Center USDA
Non ‐ tidal segments DEVELOPMENT OF FDC AND LDC DEVELOPMENT OF FDC AND LDC
USGS Gages for Flow Projection Drainage Drainage Percent Percent Percent Percent Annual Average Annual Average Mean Mean Number of Number of Gage Name Area Developed Forest/ Precipitation Flow Continuous Number (Acres) Land Wetland (in.) (cfs) Data Points Vince Bayou at 4863 4863 98 % 98 % 1 % 1 % 53.1 53.1 17.3 17.3 4018 4018 08075730 08075730 Pasadena P d Sims Bayou at 13279 78 % 7 % 50.3 38.8 4018 08075400 Hiram Clarke St
Flow Duration Curve (FDC) Segment 1113C: Unnamed Tributary to Horsepen Bayou 1.E+03 1.E+02 Flow Hydrologic Exceedance Condition w (cfs) Percentile Class 1.E+01 0 20 0 ‐ 20 High High Flow 20 ‐ 80 Mid ‐ range 80 ‐ 100 Low 1.E+00 1.E-01 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile
Load Duration Curve (LDC) 1.E+06 WLA = 1 1.E+05 0 9 /day) TMDL = Σ WLA + Σ LA + MOS Waste Load y Load (10 1 E 04 1.E+04 ily Load (10 9 /day) Allocation TMDL LA = Non-Point Source Runoff 1 Load 1.E+03 Coli Daily E. Coli Dai Allocation MOS = • WWTF • WWTFs 1.E+02 • SSOs • SSOs Margin of • Permitted Stormwater • Permitted Stormwater • WWTFs s S f t Safety E. • Illicit Discharges 1 1.E+01 WWTF Wasteload Allocation 1.E+00 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile Flow Exceedance Percentile
LDC for 1113C Load at Single Sample WQ Criterion 1.E+04 Load at Single Sample WQ Target ay) EC Observations d (10 9 /da WWTP Wasteload Allocation Wet Weather Influenced EC Observations 1.E+03 Existing Geomean Load Daily Loa 1.E+02 chia coli D 1.E+01 1.E+00 1 E+00 Escheric 1.E-01 0 0 10 10 20 20 30 30 40 40 50 50 60 60 70 70 80 80 90 90 100 100 Flow Exceedance Percentile
Tidal segments TIDAL PRISM MASS BALANCE TIDAL PRISM MASS BALANCE
Tidal Prism Model
Next Steps Next Steps • Complete FDCs and LDCs Complete FDCs and LDCs • Complete tidal prism mass balance • Draft TSD f S • Prepare Water Quality Management Plan (WQMP) Update tool • Status report for FY13 p • TSD and WQMP tool FY14
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